After weeks of tumbles toward new contract lows, the month of March is looking mighty so far for grains on the Chicago Board of Trade (CBOT).

Hefty global grain supplies, competition for export business anchor prices
Corn, soy firm ahead of USDA data
Corn drifted upward, soybeans declined
Exports the most likely category to see changes, analyst says
Most analysts expect USDA to lower its Brazil harvest estimate
Brazil soy harvest running ahead of schedule compared to last year
Slowing Chinese demand also weighs on prices